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Date:   Tue, 9 Nov 2021 00:36:57 -0800
From:   Christoph Hellwig <hch@infradead.org>
To:     "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc:     "Darrick J . Wong " <djwong@kernel.org>, linux-xfs@vger.kernel.org,
        linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-block@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
        Christoph Hellwig <hch@infradead.org>
Subject: Re: [PATCH v2 01/28] csky,sparc: Declare flush_dcache_folio()
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On Mon, Nov 08, 2021 at 04:05:24AM +0000, Matthew Wilcox (Oracle) wrote:
> These architectures do not include asm-generic/cacheflush.h so need
> to declare it themselves.

In mainline mm/util.c implements flush_dcache_folio unless
ARCH_IMPLEMENTS_FLUSH_DCACHE_FOLIO is set.  So I think you need to
define that for csky and sparc.